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Investment Securities - Additional Information (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]
Realized gross gains	$ 457,000essa_RealizedGrossGains	$ 766,000essa_RealizedGrossGains	$ 343,000essa_RealizedGrossGains
Realized gross losses	124,000essa_RealizedGrossLosses	17,000essa_RealizedGrossLosses	0essa_RealizedGrossLosses
Proceeds from the sale of investment securities	25,354,000	39,212,000	44,844,000
Investment securities with carrying values	136,053,000	50,162,000
U.S. Government Agency Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities sold under agreement to repurchase and other borrowings	0
Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities sold under agreement to repurchase and other borrowings		$ 14,795,000

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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